IOTA/IOTA-ES occultation update for (245) Vera / UCAC4 311-252169 event on 2024 Jul 26, 17:20 UT Visible from Summary ------- On 2024 Jul 26 UT, the 73.63 km diameter asteroid (245) Vera will occult a 12.0 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.88 mag to 12.20 mag (the magnitude of the asteroid) for at most 6.090 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2024 Jul 26, 17:12 - 2024 Jul 26, 17:29 * geocentric midpoint of event [JD]: 2460518.22281308 * magnitude of target star: 11.96 * magnitude drop [mag]: 0.88 * estimated maximum duration [s]: 6.090 * Moon: 66 % sunlit, 84° distance * Sun: 166° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 75 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.032, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.032", 0.001", 84°) * approx speed of asteroid's shadow [km/s]: 12.0866 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 311-252169 by 245 Vera on 2024 Jul 26 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 13 0 0 -20 18 17 17 29 29.0 1 120 13 -19 54 58 -20 41 38 -19 51 44 -20 44 53 .... - 12 0 0 -20 50 27 17 29 28.7 2 119 12 -20 27 10 -21 13 46 -20 23 56 -21 17 1 0.22 - 11 0 0 -21 22 18 17 29 28.4 3 119 11 -20 59 3 -21 45 34 -20 55 49 -21 48 48 0.20 - 10 0 0 -21 53 48 17 29 27.8 4 119 10 -21 30 36 -22 17 2 -21 27 22 -22 20 16 0.19 - 9 0 0 -22 24 57 17 29 27.0 5 118 9 -22 1 47 -22 48 8 -21 58 34 -22 51 22 0.19 - 8 0 0 -22 55 44 17 29 26.1 6 118 8 -22 32 37 -23 18 53 -22 29 25 -23 22 6 0.19 - 7 0 0 -23 26 10 17 29 25.0 7 117 6 -23 3 5 -23 49 16 -22 59 53 -23 52 29 0.19 - 6 0 0 -23 56 12 17 29 23.7 8 117 5 -23 33 11 -24 19 16 -23 29 59 -24 22 28 0.19 - 5 0 0 -24 25 52 17 29 22.3 9 117 4 -24 2 54 -24 48 52 -23 59 42 -24 52 4 0.18 - 4 0 0 -24 55 8 17 29 20.7 10 116 3 -24 32 12 -25 18 5 -24 29 1 -25 21 17 0.18 - 3 0 0 -25 24 0 17 29 18.9 11 116 2 -25 1 7 -25 46 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0 9 10 17 12 13.3 2 242 -13 0 13 49 - 0 32 11 0 17 1 - 0 35 23 0.33 -179 0 0 0 23 2 17 12 13.0 1 242 -12 0 45 59 0 0 4 0 49 10 - 0 3 8 0.63 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 311-252169 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 37 36.5981 DE: -27 54 48.914 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 37 36.5980 DE: -27 54 48.914 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.0 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (245) Vera asteroid class: approx. diameter [km]: 74 approx. diameter ["]: 0.049 distance from Earth [AU]: 2.05450 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#135 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.032", 0.001", 83.915° remarks: * orbital elements for (245)Vera : Mean anomaly = 285.5544648290 deg Arg. of pericenter = 331.8974970496 deg Long. of node = 61.0357658026 deg Inclination = 5.1793001672 deg Eccentricity = 0.1976301167 Semimajor axis = 3.0958562275 AU Perihelion dist = 2.4840218001 AU Mag: H = 7.83, G = 0.15 Epoch of elements : MJD 60517.72281354 TDT (2024 Jul 26.7228) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1352023Apr24,6.09,2024,7,26,17.347514,0.038583,-0.186093,-6.680546,-1.382087,0.001046,0.000788,0.000001,0.000000 89.6828,-27.8582,-78.57,19.21,False UCAC4 311-252169,19.62683280,-27.9135871,12.25,11.96,11.80,0.0,0,K,19.65261104,-27.8582093,0.88,0.73,0,0,0 245,Vera,12.20,73.630,2.0545,0,0,-2.156,-5.91,,3.8,0 0,285.4237,2024,7,26,331.8975,61.0358,5.1793,0.19763,3.09586,2.48402,7.82,5.0,0.15 1.069,0.0320,0.0014,84,0.0034,Known errors,0.99,0,-1,-1 20240726_252169,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org